Spin-resolved electronic structure of ferroelectric alpha-GeTe and multiferroic Ge1-xMnxTe
| Autor: | V. V. Volobuiev, François Bertran, Wilayat Khan, Stefan Muff, G. Springholz, Matthias Muntwiler, Vladimir N. Strocov, Jan Hugo Dil, Jan Minár, J. Krempaský, N. Pilet, A. P. Weber, Mauro Fanciulli |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics Photoemission spectroscopy 02 engineering and technology General Chemistry Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity Magnetization Dipole chemistry.chemical_compound Polarization density Condensed Matter::Materials Science chemistry 0103 physical sciences surface General Materials Science Multiferroics Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Germanium telluride |
| Popis: | Germanium telluride features special spin-electric effects originating from spin-orbit coupling and symmetry breaking by the ferroelectric lattice polarization, which opens up many prospectives for electrically tunable and switchable spin electronic devices. By Mn doping of the α-GeTe host lattice, the system becomes a multiferroic semiconductor possessing magnetoelectric properties in which the electric polarization, magnetization and spin texture are coupled to each other. Employing spin- and angle-resolved photoemission spectroscopy in bulk- and surface-sensitive energy ranges and by varying dipole transition matrix elements, we disentangle the bulk, surface and surface-resonance states of the electronic structure and determine the spin textures for selected parameters. From our results we derive a comprehensive model of the α-GeTe surface electronic structure which fits to experimental data and first principle theoretical predictions and we discuss the unconventional evolution of the Rashba-type spin splitting upon manipulation by external B- and E-fields. |
| Databáze: | OpenAIRE |
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